Jason Gunthorpe b4f53fe23e vfio/pci: Fix vf_token mechanism when device-specific VF drivers are used ... [ Upstream commit 1ef3342a93 ] get_pf_vdev() tries to check if a PF is a VFIO PF by looking at the driver: if (pci_dev_driver(physfn) != pci_dev_driver(vdev->pdev)) { However now that we have multiple VF and PF drivers this is no longer reliable. This means that security tests realted to vf_token can be skipped by mixing and matching different VFIO PCI drivers. Instead of trying to use the driver core to find the PF devices maintain a linked list of all PF vfio_pci_core_device's that we have called pci_enable_sriov() on. When registering a VF just search the list to see if the PF is present and record the match permanently in the struct. PCI core locking prevents a PF from passing pci_disable_sriov() while VF drivers are attached so the VFIO owned PF becomes a static property of the VF. In common cases where vfio does not own the PF the global list remains empty and the VF's pointer is statically NULL. This also fixes a lockdep splat from recursive locking of the vfio_group::device_lock between vfio_device_get_from_name() and vfio_device_get_from_dev(). If the VF and PF share the same group this would deadlock. Fixes: ff53edf6d6 ("vfio/pci: Split the pci_driver code out of vfio_pci_core.c") Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/0-v3-876570980634+f2e8-vfio_vf_token_jgg@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-04-20 09:36:18 +02:00
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fsl-mc	bus: fsl-mc: fsl-mc-allocator: Rework MSI handling	2021-12-16 22:16:41 +01:00
mdev	vfio: simplify iommu group allocation for mediated devices	2021-09-30 12:46:44 -06:00
pci	vfio/pci: Fix vf_token mechanism when device-specific VF drivers are used	2022-04-20 09:36:18 +02:00
platform	vfio: Move vfio_iommu_group_get() to vfio_register_group_dev()	2021-09-30 12:46:43 -06:00
Kconfig	vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on'	2021-08-26 10:36:51 -06:00
Makefile	…
vfio.c	vfio: remove all kernel-doc notation	2021-11-30 11:41:43 -07:00
vfio.h	vfio: clean up the check for mediated device in vfio_iommu_type1	2021-09-30 12:46:44 -06:00
vfio_iommu_spapr_tce.c	vfio/spapr_tce: reject mediated devices	2021-09-30 12:46:44 -06:00
vfio_iommu_type1.c	vfio/iommu_type1: replace kfree with kvfree	2021-12-21 12:30:34 -07:00
vfio_spapr_eeh.c	…
virqfd.c	vfio/virqfd: Drain events from eventfd in virqfd_wakeup()	2020-11-15 09:49:10 -05:00